DETERMINATION OF VOLUME FLOW RATE

The invention relates to a volume flow rate detection device of a fan comprising a motor (M) having a speed controller (D) and at least one microcontroller (10), wherein the speed n of the motor (M) is input at an input of the microcontroller as an input variable in the form of a digital signal, in order to determine the pressure difference deltap generated by the impeller wheel at this speed and the volume flow rate deltaV/deltat at a location x in a flow channel of the fan in a specific installation situation of a system (A), by means of a simulation model (SM) stored in a memory of the microcontroller (10), and in order to adjust the speed n of the motor accordingly by means of the speed controller in the event of a deviation from a setpoint volume flow rate deltaVSoll/deltat. 本发明涉及一种具有马达(M)的通风机的体积流量检测装置，该体积流量检测装置包括转速调节器(D)和至少一个微控制器(10)，其中，在微控制器的输入端上输入马达(M)的转速n作为数字信号形式的输入参量，以便借助存储在微控制器(10)的存储器中的模拟模型(SM)在设备(A)的确定的安装情况下确定由工作轮在该转速下产生的压力差Δp和在通风机的流动通道中的位置x上的体积流量ΔV/Δt，并且在与额定体积流量ΔV额定/Δt有偏差时相应地通过转速调节器适配马达的转速n。